JPH067583Y2 - Cable connection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of the Invention> The present invention relates to a cable connection device using a connector with a waterproof function.

<Prior Art and Problem> Conventionally, as this type of device, a cable is inserted through a rear end opening of a cylindrical case that is screwed to the outer periphery of the rear end of a connector body, and an annular protrusion is formed on the cable. -Shaped rubber bush is inserted, and the annular projection is elastically deformed by a seal cap screwed to the outer peripheral surface of the rear part of the case and pressed against the outer peripheral surface of the cable, thereby providing a waterproof function and a cable holding function. There is something.

By the way, in such a waterproof type, since it is used for being routed and wired for connection to an external device, a relatively large cable holding force is required. This cable holding force is the frictional force between the cable and the rubber bush,
Although it depends on the cable pressing force, the frictional force is comparatively small, and therefore the cable pressing force must be set to a large value to enhance the cable holding force.

However, in the conventional type, since the cable pressing force is obtained only by the elastic force of the rubber bush, if the cable outer casing ages and plastically deforms after long-term use, the waterproof property is impaired and the cable holding force also decreases. . Moreover, since the rubber bush has both a waterproof function and a cable holding function, when the cable is bent strongly, the waterproof function is also directly affected.

<Purpose of the Invention> The present invention has been made in order to solve the problems of the above-mentioned conventional ones, and an object thereof is to provide a cable connecting device capable of improving the waterproof property and enhancing the cable holding force with a simple structure. Has an aim.

<Structure and Effect of the Invention> A cable connecting device according to the present invention comprises a connector main body having a rear end face protruding a connection terminal to which a cable core wire is electrically connected, and a connector main body mounted on the rear side of the connector main body.
A cylindrical case through which a cable is inserted through an opening that widens toward the rear, a cylindrical elastic bush that is inserted through the cable and abuts the inner peripheral surface of the opening, and a rear outer periphery of the case that is inserted through the cable The outer peripheral surface of the elastic bush is formed by a cylindrical seal cap screwed to a threaded portion formed on the surface and a tapered inner peripheral surface of the opening that is fitted in the seal cap and is in a screwed state of the seal cap. And a plurality of elastic claws, which are formed on the rear edge of the fixing ring in the circumferential direction so as to be evenly arranged in the circumferential direction and press the outer peripheral surface of the cable into the biting shape in a screwed state of the seal cap. .

According to this invention, when the seal cap is screwed on, the cylindrical elastic bush is pressed by the tapered inner peripheral surface of the rear end opening of the case and the fixing ring. The outer peripheral surface of the is closely contacted with an elastic bush for high waterproof performance, and the elastic claws formed on the fixing ring bite into the cable to obtain a firm cable holding force with a small cable pressing force. You can

In particular, since the cable holding function by the elastic claw and the waterproof function by the elastic bush are divided into different positions, it is possible to avoid the adverse effect on the waterproof property due to the bending of the cable.

<Description of Embodiments> An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing an example of a cable connecting device according to the present invention.

The circular connector 1 in the cable connection device of this example is
The reverse type connector main body 2 to which the cable M is connected, an annular fixture 3, a cylindrical case 4, a cylindrical seal cap 5, and the like are provided.

The structures on the side of the connector body 2 and the case 4 are shown in FIGS. 2a and 2b.

In the figure, the connector body 2 is formed of an electrically insulating synthetic resin or the like into a substantially cylindrical shape, and the fixing member 3 is provided on the outer peripheral surface of the front portion 2a.
Is rotatably fitted to the outside, and the fixing member 3 is attached to the central portion.
The retaining annular projection 11 is integrally formed. 12
Is a connector body fitting hole formed in the fixture 3. 1
An O-ring 3 is located on the front side of the annular convex portion 11 and is fitted on the outer peripheral surface of the front portion of the connector body 2. A hollow portion 14 is formed in the connector body 2 along the axial direction, and a contact 15 is accommodated in the hollow portion 14. A socket-shaped portion 15a is formed at a front end portion of the contactor 15, and a rear end portion 15b is projected to the outside from a rear end surface of the connector body 2 as a connection terminal and electrically connected to the core wire Ma of the cable M. It is connected.

Reference numeral 16 denotes a first annular groove formed on the outer peripheral surface of the rear portion 2b of the connector body 2, and the first annular groove 16 has:
A C-shaped spring 17 for locking the case is fitted, and its surface is set to float from the outer peripheral surface.
A second annular groove 18 is formed behind the annular ring 16, and an O-ring 19 that is pressed against the inner peripheral surface of the case 4 described later is fitted in the second annular groove 18. 20
Is a threaded portion formed on the inner peripheral surface of the fixture 3.

An annular recess 21 is formed on the inner peripheral surface of the case 4 at the front end side. This is the above C-shaped spring 1
It engages with 7 in a detachable manner. Reference numeral 22 is a cable fitting hole in the case 4, and 23 is a cable inserting opening that is connected to the rear side of the fitting hole 22, and the inner peripheral surface thereof is formed in a rearward widened shape. Reference numeral 24 denotes a screw portion formed on the outer peripheral surface of the rear portion of the case 4.

The structure around the case 4 and the seal cap 5 will be described with reference to FIGS. 3a and 3b.

In the figure, the seal cap 5 is detachably attached to the case 4 by screwing a screw portion 25 formed on the front inner peripheral surface of the seal cap 5 into the screw portion 24 on the case 4 side. There is. Reference numeral 26 is a cable insertion hole formed on the rear surface of the seal cap 5. Reference numeral 27 denotes a cable fixing ring which is fitted to the cable M and is made of a synthetic resin or the like, and a tip end side thereof extends obliquely toward the outer peripheral surface of the cable M at positions equidistantly arranged in the circumferential direction on the rear edge thereof. A plurality of elastic claws 28 are integrally formed. These elastic claws 28 are pressed against the outer peripheral surface of the cable M in a biting manner, and can be easily manufactured by forming a slit 29 on the peripheral wall of the fixing ring 27. Thirty
Is a cylindrical rubber bush inserted into the cable M, and when the seal cap 5 is screwed into the case 4, the taper inner peripheral surface of the cable insertion opening 23 of the case 4 and the fixing It is adapted to be pressed against the inner peripheral surface of the ring 27.

Next, a procedure for assembling the cable connecting device having the above configuration will be described.

As shown in FIGS. 2a and 2b, the cable M is inserted through the seal cap 5, the cable fixing ring 27, the rubber bush 30 and the cylindrical case 4 in this order, and then the core Ma of the cable M is attached to the connector body 2 side. Connection terminal 15b
It is electrically connected and fixed by soldering.

Then, the cylindrical case 4 is fitted into the rear end portion 2b of the connector body 2 as shown in FIG. 2b, and is operated to fit in the annular recess 21 of the inner peripheral surface of the case 4 in the substantially C-shaped spring on the connector body 2 side. Since 17 is elastically engaged, the connector body 2 and the case 4 are coupled.

Further, the rubber bush 30 is brought into contact with the tapered inner peripheral surface of the case insertion opening 23 of the case 4, the fixing ring 27 is externally fitted to the rubber bush 30, and the screw portion 25 of the seal cap 5 is screwed into the case 4. If it is screwed into the part 24, the 3b
As shown in the figure, the rubber bush 30 is press-fitted into the opening 23 and fixed together with the fixing ring 27.

Here, when the seal cap 5 is screwed, the rubber bush 30 is pressed and deformed by the tapered inner peripheral surface of the rear end opening 23, and at the same time, is pressed against the inner peripheral surface of the fixing ring 27. 30 is the elastic reaction force of the opening 2
The inner peripheral surface of the cable 3 and the outer peripheral surface of the cable M are closely attached. Therefore, the liquid tightness of both 22 and the M pipe is secured.

Further, since the tip of the elastic claw 28 of the fixing ring 27 is pressed into contact with the outer peripheral surface of the cable M by screwing the seal cap 5, a large cable holding force can be generated even with a relatively small cable pressing force. Therefore, even if it is used for a long period of time and the outer skin of the cable M is deteriorated, it is possible to exert an effective cable retaining effect.

Further, the rubber bush 30 provides waterproofness, and the elastic claws 28 of the fixing ring 27 provide cable holding force.
Since it works separately in different positions,
Even if a bending force is applied to the cable M, the rubber bush 30
Therefore, the force is not applied to the waterproof portion, and therefore, the waterproof property is also favorably maintained.

Further, since the elastic claw 28 extends obliquely and the rubber bush 30 is also deformed along the tapered inner peripheral surface of the opening 23, the compatible diameter of the cable M can be increased.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a cable connecting device according to the present invention, and FIGS. 2a and 2b show the structure of the connector body and the case side of the cable connecting device before and after assembly, respectively. Partially broken plan view,
FIG. 3a and FIG. 3b are partially cutaway plan views showing configurations of a connector body and a seal cap side in the same cable connecting device before and after assembling, respectively. 2 ... Connector body, 4 ... Case, 5 ... Seal cap,
15b ... Connection terminal, 23 ... Opening, 24 ... Screw part, 27 ...
Fixing ring, 28 ... elastic claw, 30 ... elastic bush, M ...
Cable, Ma ... Core wire.

Claims (1)

[Scope of utility model registration request] 1. A connector body having a rear end surface on which a connection terminal to which a cable core wire is electrically connected is projected, and a cylinder which is mounted on the rear side of the connector body and through which a cable is inserted through a rear end wide opening. -Shaped case, a cylindrical elastic bush that is inserted into the table and abuts the tapered inner peripheral surface of the opening, and a threaded portion that is inserted into the cable and is formed on the rear outer peripheral surface of the case. A cylindrical seal cap to be screwed, a fixing ring which is fitted into the seal cap, and presses the outer peripheral surface of the elastic bush with the tapered inner peripheral surface of the opening in a screwed state of the seal cap, A cable connection, characterized in that a plurality of elastic claws are formed on the rear edge of the fixing ring in the circumferential direction so as to equip the outer peripheral surface of the cable in a biting manner with the sealing cap screwed on. Apparatus.